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'use strict';
// This tests to make sure that modules with symlinked circular dependencies
// do not blow out the module cache and recurse forever. See issue
// https://github.com/nodejs/node/pull/5950 for context. PR #5950 attempted
// to solve a problem with symlinked peer dependencies by caching using the
// symlink path. Unfortunately, that breaks the case tested in this module
// because each symlinked module, despite pointing to the same code on disk,
// is loaded and cached as a separate module instance, which blows up the
// cache and leads to a recursion bug.
// This test should pass in Node.js v4 and v5. It should pass in Node.js v6
// after https://github.com/nodejs/node/pull/5950 has been reverted.
const common = require('../common');
const assert = require('assert');
const path = require('path');
const fs = require('fs');
// {tmpDir}
// ├── index.js
// └── node_modules
// ├── moduleA
// │ ├── index.js
// │ └── node_modules
// │ └── moduleB -> {tmpDir}/node_modules/moduleB
// └── moduleB
// ├── index.js
// └── node_modules
// └── moduleA -> {tmpDir}/node_modules/moduleA
const tmpdir = require('../common/tmpdir');
tmpdir.refresh();
const tmpDir = tmpdir.path;
const node_modules = path.join(tmpDir, 'node_modules');
const moduleA = path.join(node_modules, 'moduleA');
const moduleB = path.join(node_modules, 'moduleB');
const moduleA_link = path.join(moduleB, 'node_modules', 'moduleA');
const moduleB_link = path.join(moduleA, 'node_modules', 'moduleB');
fs.mkdirSync(node_modules);
fs.mkdirSync(moduleA);
fs.mkdirSync(moduleB);
fs.mkdirSync(path.join(moduleA, 'node_modules'));
fs.mkdirSync(path.join(moduleB, 'node_modules'));
try {
fs.symlinkSync(moduleA, moduleA_link);
fs.symlinkSync(moduleB, moduleB_link);
} catch (err) {
if (err.code !== 'EPERM') throw err;
common.skip('insufficient privileges for symlinks');
}
fs.writeFileSync(path.join(tmpDir, 'index.js'),
'module.exports = require(\'moduleA\');', 'utf8');
fs.writeFileSync(path.join(moduleA, 'index.js'),
'module.exports = {b: require(\'moduleB\')};', 'utf8');
fs.writeFileSync(path.join(moduleB, 'index.js'),
'module.exports = {a: require(\'moduleA\')};', 'utf8');
// Ensure that the symlinks are not followed forever...
const obj = require(path.join(tmpDir, 'index'));
assert.ok(obj);
assert.ok(obj.b);
assert.ok(obj.b.a);
assert.ok(!obj.b.a.b);
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